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2007-01-22
Problem diagram.
Black plays.
Source:
Go World #37, Autumn 1984, p. 34
Kobayashi Koichi vs. Kato Masao
Commentary Ohira Shuzo
Solution follows
(or click here to download SGF)
Correct.
Black should have forced at 1 first.
White would probably respond with 2, after
which the aji from Black 1 allows Black A
to reduce the side moyo.
In the game, Black did not play at 1, and White
got 50+ points on the left side.
If White plays at B instead, Black C not only is
sente, but also removes White aji in the area.
Too slow.
Black 1 misses the key sente move above, but in the
game White answers in kind with the slow move
at 2. After Black surrounds the bottom with 5,
White does not have a chance to win.
White variation.
White 2 is the correct response after Black's
slow move. White has no
risk of losing this stone. After White 8, the
game is still up for grabs.
Black variation.
If Black tries the local shape move at 3 instead,
White has good prospects after 4.
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